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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4712452bf8b88be3bc08b52d69046094f8468055f567512eeb4b677aa7dffe89' 
  AND token = 'Ni95HRzzyKaAsr6W9Qg13mgRC7DHNqLd68avrX213mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}